I've had these thoughts as a teenager but got diagnosed at 32.

> it becomes a medical condition you've been stuck with.

It can feel like this. However, for me, it was much more of a "finally, an explanation!". It showed me my limits are a bit lower than I hoped for, but it gave me immense clarity about those limits. Plus finding your limits, realising there are things you'll never achieve... I think that's anyone's fate sooner or later. It's okay.